Gas water heater



2. 1M] YW GAS WATER HEATER m y @www R. G. GRiSWOLD Filed Dec. 4, 1925 Nov. v6, 1928.

Patented Nov. 6, 1928.

1 UNITED STATES PATENToFFICE- ROBERT G. GRIS SEARCH COMPANY, OF' NEW Y WOLD, 0F WESTFIE L n, NEW JERSEY, omi,- N. Y., A conro ASSIGNOR TO .DOHERTY RE- RATION 0F DELAWARE.

' GAS WATER HEATER.

Application filed Decemberl, 1925.

e-present inventionA relates to means for heatlng water contained in the ordinary hot water tank or stan in houses. narily heated by a coll adapted t ing furnace or kitchen range.

d-boiler commonly found The water in such tanks is ordipassing the water through o be heated yby the house heat- VVhen gas becomes available many householders would like-to' use it for water heating purposes but for the expense involved in installing the customary gas burning apparatus.

The present invention has for its objects to provide a gas burning apparatus for use 1n connecti relatlvel on with stand-boilers that shall be y inexpensive as compared with the customary gas hot-water be efficient and safe in o shall be capable of bein heaters; that shall peration, and that g vreadily installed without interfering with such heating devices as may have The gas burning ed that the burning posed portion of th been previously provided. apparatus is so constructgas will flow along an exe outside cylindrical surface of the water tank whereby the water in the tank will' be he directly through apparatus is in th adapted to be se shell being provi tending lines wh their upper ends, one

pear from the det connection with th forming part of th ated by transmittal of heat the walls of the tank. The e nature ofa jacket or shell cured around the tank, the ded with two upwardly exich are in comm unication at the burning gas going upv flue and down the othe features of constru r.- T e various ction will more ailed e acc eir s description taken in ompanymg drawings peclficatlon.. y

Referring to the drawings' wherein the preferred form of is a view showing encased by a shell flues through which the part of the shel its construction;

Fig. 2 is a. ,view in the assembly from the dicating the arrows the directio dotted lines in gases; and

l being brok apparatus is shown, Fig. 1

a stand-boiler or tank as within which is a pair of burning gases pass, en away to show elevation looking at left in Fig. 1, the the flue passages and n of travel of the flue Fig. 3 is a transverse section throughvthe assembly, the view b eing taken on lines 3--3 of Fig. 1 and illustrating constructional features of the shell.

In the drawings, as supported on a a stand-boiler 10 is shown fully ap- Serial No 73,16'7.

pro-vided with acold water supply pipe ,14 and a hot Water outlet-16, both arranged as usual. j

The water ,in the boiler is adapted to be heated by the burning of a small jet of gas issuing from the Bunsen burner 18 or similar .simple type burner fed with gas through a .pipe 20. The burning gases and products of combustion low'along a fixed path on the outside surface of the boiler, said path preferably taking the form of two upright ilues or channels 22 and 24 separated by a partition 26 except at their upper ends which are in Aopen communication as indicated at 28. Products of combustion leave the flue 24 by way of a suitable draft pipe 30 leading from the lower end of said flue.

The channels 22 and 24 are formed in a body which preferably, though not necessarily, is made from heat insulating sheet material, such as corrugated paper 32 and which is preferably formed as encase the boiler as shown, the body when made as a boiler enclosing jacket being preferably separable into two arts on the boiler diameter. That portion o the body in whichthe flues 22 and 24 are formed is made fireproof in any suitable manner but preferably 'by first providing a layer of asbestos 34.- and a `layer of adamant cement 36 next to that. The partition 26 may be of any suitable material but is preferably made of 'a mixture of asbestos and cement. B forming the flue lining and partition of p astic materials, the flue and partition may be readily formed and moulded in one operation thereby reducing the cost of manufacture.

The top of the boiler is over y the jacket primarily to prevent radiation of heat therefrom and secon able the jacket to be readily held in place on the boiler. However, the jacket may rest at its lower end onA the rim 38 of the boiler supporting stand 12 as shown.

It will beclear from'the foregoing and from the drawing that the jacket Yof corrupreferably covered gated material 32 covers and contacts with I' darily to envV a vertical line to fraction only of the vertical area ofthe boiler or tank.

From the. foregoing -description it will be appreciatedthat .the present invention provides a simple, practical and inexpensive apparatus for enabling a Water boiler .to be e'ated with gas. The body in which the fines are formed is readily secured to the stand A boiler and When-the bodyis made of corrugated paper and is made in the -form of a Jacket which enoloses the boiler'the 'radia- -tion losses from the boiler Will obviously be negligible and hence a very small amount y will be sufficient to heat the water within l Tests on the apparatus described above i 'have shown that comparativelyVA high combustion eiciencies may be obtained With this apparatus. The apparatus is designed more particularly to use a steady` burning gas llame to maintain a body of Water in the tank Y at substantially the desired temperature at exhaust gases directly into the room in whic the apparatus isplaced, if so desired, instead of being exhausted into the outside air.

the boiler to the desired temperature.

While the apparatus is preferably constructed in the manner shown in the drawings, it is obvious that certain changes may be resorted to without departing from the spirit of the invention. Reference is therefore made to the appended claims fora definitionl -of the scope of the invention.

I claim: v 1

l. An article of manufacture comprising a heat-insulating jacket of fibrous material, a longitudinall ,extending salient .portion formed in one side of the jacket and grooved along its inner face, a partition dividing said portion for the major part of its length into two channels which are in communication at one of their ends, the channels and partition being constructedoitire-resistant material.

2. The combination with a Water tank set with its longitudinal axis in the vertical position of an external heat insulating jacket for said tank7 saidjacket covering and contacting lwith substantially the entire top and vertical surface of said tank but being spaced from a portion .of said tank along a vertical line, the area over Which said jacket is spaced from said tank being a small fraction only of the vertical area of the tank, said space between the Ajacket and tank being closed at the top, vertical means dividing the space between said jacket and tank into fines connected at their tops and open at their bottoms, and a gas burner set to discharge upwardly into one of Said lues.

In testimony whereof I afiix my signature ROBERT G. GRISVOLD 

